“The car is obviously shaped like a boat underneath, and the propellers are in the back,” he said.

During the 1960s, almost 4000 Amphicars were manufactured, retailing for about $3500. Now they’re worth upwards of $120,000.

Most sales came from the United States, including one purchased by former President Lyndon B. Johnson.

In fact, one of his favourite pranks was to drive the car straight off a bridge, claiming the brakes had failed, as his terrified passengers clambered for the doors.

As we glide across to Shark Island, we cop a couple of big waves thanks to some very curious ferries coming a little too close for comfort, and there’s really not much you can do except hope a strong grip and stronger stomach will keep you afloat.

But as I look out at the Harbour Bridge and Opera House from the leather passenger seat of a car, with my hand gently touching the soft waves, I have to admit, it’s one incredible ride that I’ll never forget.